Hitachi HS630 NH7183

Possible cause of failure:
Customer stated it had a catastrophic rear bearing failure.
Rear bearing journal is undersized by -4/-7 microns (iso is +/- 5) with fretting
Taper is pock marked
Drawbar was wet with coolant, rotory union apppears to have been leaking
Recommended action:
Clean, inspect overall dimensions.
Replace bearings.
Grind chrome plate and regrind 85mm rear journal.
Kiss grind the taper
Customer to replace rotory union
Adjust preload, balance, assemble and break in. Final quality control inspection.



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